Juan Manuel Santos, sworn in Saturday as Colombia's 59th president, vowed to cement security gains but declared himself open to dialogue with rebels in hopes of ending the Western Hemisphere's only armed conflict.

The Pentagon said Monday that it was trying to assess the damage caused by the Internet leak of some 91,000 classified documents on the Afghanistan war. The documents are described as battlefield reports compiled by various military units that provide an unvarnished look at combat in the past five years, including U.S. frustration over reports Pakistan secretly aided insurgents and civilian casualties at the hand of U.S. troops.